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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f254f742413c03180661a5269ce60982c9aff793514fc52dba8048ecdb698a19' 
  AND token = 'F59qCMn14p5yUE+FtCtMeK+TACO1Ujrd0EC7dhzJe5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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