SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f823915bc52587c91dd21c041300d77c1cca6dd88174860783efdc526b397438' 
  AND token = 'DgrQtZIkYMgJGqrAGuUJ/I3RVgjsbJFYIpRjQC9O5ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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