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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '585fb119a1e2b581c7ba64a5ed8db2e700bd4dbfc0681d4e03761740f43b5034' 
  AND token = 'YSdXQjI0+DBDLN769TwDXY6V1lyhM2wQ19Zxy6lJK94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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