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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '256e44c64df99639035ee05cfef7ea047c3b44891fb1ae6f0471da633d5245b3' 
  AND token = 'Ql992xmHaj1r1rz41xv6+RmSbgZm5Y4vNScZFjI3Q3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}