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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1828d3e180cd35859da8890b647792bcfec1d103ca000a8b2acd86461fd1efd5' 
  AND token = 'nGQVuZGv0mBkhhcKw0k7ed6W7j3CswyERymFfDeJiTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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