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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae2cb0b64a37daf99c32876f93a155887a3442e831475a32fdb82732186d9b66' 
  AND token = 'i1Ulhq6cRSapxKDVGq9xs8bto+4l8iRAFc8+XLqJ5a8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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