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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79d6a92ae21d3edcc5215fc33db78f28b1c18602bc4a9cd255d4347d21ff1192' 
  AND token = 'c36PhZ6pysZamUdqWZVrUWKCIGo7JVBShc5Rrxh4idc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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