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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c93649978bfad0708c25c2e98d3fbc3a6b0b082ddc1e6c5b39c10abe5604961b' 
  AND token = 'C1Wn+3arq6dMq0gVKjlxnfrsX0yodpsxUEh2cquIpOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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