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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a5a9c052e649da1a86e02e9576923fe508150ed8531ae3b8e3287267d02aabb' 
  AND token = '24HMDkmvRZkfpR6gImb8nf6XaAb8pWNZDT55pILvg+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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