SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62726824674bb61499f9ff4312187eb473c1627b7616a539d28a5f8869df0951' 
  AND token = 'T0KD6j1zGfcsYV/OxvHzoeXm0nrLklERdhxOuaSCGMA=' 
  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"
    }
  }
}