SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d5bfa26841cfb7e882b1c09be1f0bfa8931a45f5f9bc9dc2ac599e577180663' 
  AND token = 'isBeTvanY+FZkTpciHBJhhPNpMXQluI6qdp+YpBYRJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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