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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0166623bf229d620b6a8eb8a55e3a4418d2797624c5d896b920b4d1794f7fd51' 
  AND token = '0NoEbuDOt9sd/lGOK5kH0UkXGQoAMMS/btJoOcDOHcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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