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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dbbade2b56412e2a5eacb4168e0469c1fba81dea1fd7cd336ec8ae826a274c7' 
  AND token = 'rg0e7SUSdVwxxMCMVAMbD264+4N6AFfeNkinr7yIgsA=' 
  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"
    }
  }
}