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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af65b8e03cba2131e9cc39d9e089598bb00e3ca5e0ce9e169347419622a3d6b8' 
  AND token = 'EbLXj5W5JUgP2eBaUvZwP8eZXplW6tkBZWYV9ii+c1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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