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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '981cf4074e87e98a7106219b2b3031d7fd6dc0e53882542c0bc265eb8f90567f' 
  AND token = 'qyCA8BpmsFWpF2flLCpvkN42bs1PVpH9cecsu45jW4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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