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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52f6d22af5e39155c7ea3eb52a6dbaca75dd9a832be600a5226d7cdbd54c122c' 
  AND token = 'de/BAy+GLqc9Wd2MbxFe38zdNPld9kakwRSyKjX74DI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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