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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '098b2899c9150d1424300b6e8592dafe4d029c960b690f81d8004a9f4e605080' 
  AND token = 'Lcm0Sg4Rh8O1y1lrvX582N3On7AuKalACLaZjRxiqK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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