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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8e6589847f0ed39152718c3a722c8bc242e1252e155b2646dfb663d8a25d9be' 
  AND token = 'LfKUTqUWLLDOnO8dBH9hqC/K2BAN51QMnCrTRwDaLKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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