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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7e3e9e65f2ec379e8418e34bbf8fe35c93e08e4d94def9dd44e8f5d3337ae59' 
  AND token = 'OXA8vbAqDogLrMghUudRpfHTRVmw7clI3SsB4qLa8BU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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