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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48e7d305332526bd85a4a08d9e62a884768f89208dc233175b82a6da74229043' 
  AND token = 'zEC/foBiFy0G+tZVFktmSF8Jyjaftx21oOWXYa5WtH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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