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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52647ac7a3c4e7677087b31fd1b2833ad0a335ba674b7520ebd65b31169cc861' 
  AND token = 'h1y2iX5mmTqAepesw/nztKF1+pjlfLlZ6jSb4kvA0zE=' 
  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"
    }
  }
}