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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4d74530f1c2c52b850f1bda58553a23708acaf35706b16f486fc634e9c9e31d' 
  AND token = 'frPjU3BD5cXlThvlwqglvYrl6yeP5AIeme0eDAifcjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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