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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1327b03d7df880eddf4b1777ca4d3d04a565e5b3d15f68bef4aa2e2118f3df18' 
  AND token = 'CvVYOa2FGoW55ZDL8BNnqIYvk9LUWmbEDePyJ7GeT6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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