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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f58284253b60b0d93e9faeea8a63fb60a87aa126c36e2702598f3963aec056e' 
  AND token = 'HhAzg3gGM15z54TqSou5XolFtIolEvayNvWkrGltaT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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