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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b17870c443dcafaf9c4b34bfb328d0f9dd9ee56c71d074e6382ccef3da290926' 
  AND token = '1lLPr32Z5CtOXQngwYhhb3tGahM2WimwdmDIN/rivPI=' 
  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"
    }
  }
}