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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e05c5d52e7f599392b4808a8966bb744077546a0a36edae92b99acb03069fdad' 
  AND token = 'nOcIYx1jXn8in/1twmZ1FXhlRd8QRWW0BFIHydAn1KE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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