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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6fb78ff9c310904bea83a3870194d68c6cd9b613e78fcbfd49f120f9d3bea9f' 
  AND token = 'q2EvJB6920F88fJKxUOqzfEwOGtGXAHSm3HiGp4d25U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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