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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd66521bacb4bb98366f79cd497956688976cc247e898dd5f927ff468e03d52b2' 
  AND token = 'TDC6/gB58dYbLOUfLN864dg2AYM7GmqYswjq2r0UXxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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