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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2705892deb5f3ba27a1c8fcd873fd192b947d2b030db94d3b93f21970a4e9450' 
  AND token = 'D4qzm1NnUsVTMZqlHtfs3maNUbiIbiyRXgnI2TxESvc=' 
  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"
    }
  }
}