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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60d19fa498174d84167a7e451b616ef2e17fbb6665c35038c8c092017712e331' 
  AND token = 'ADkeIDwQhPL950SRVADx7zFlpHNpttrtr4B71lSn9To=' 
  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"
    }
  }
}