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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '501d46917a5fdf441a2557de3b5ad9cddfebf1dd4d35edf900f06310480bbe1d' 
  AND token = 'NI8FS99BC6Zga85CSB8NIXIHg2BDaB7aalGOxXGFndk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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