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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1351d1f7c10175c5f51a42bfdbf032405fa9de99c2ae64ec9c92f402b7c57124' 
  AND token = 'Y2043GpTwg0S9Yu5IlG+U7Rvwz/00X1GpxtRAqfQVTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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