Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b42b2ffd573cf8a269c70b7b966c4a1a2638a8c34fcb79b6e21b3dba7576a79b' 
  AND token = 'afSyucaDlD2/lt+8wM1zvMyad63ss7uo7qCx2bfX+sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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