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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'deb8e30e75d8ecd2444df605ce6ce7e931d7c5e5eb58f67d41a354a6f786e841' 
  AND token = 'pAXo4XodjVUQT4po51ImgpcUyf46ggWdnuMdMfGJRvk=' 
  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"
    }
  }
}