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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd558223874a6155981af6e7f3c271acfc13123cd01cde64762da663c5f62a226' 
  AND token = '/f63xgpH7KYn2RGnwBxVlPO3eeLCIJIjIbEK41Ze5cY=' 
  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"
    }
  }
}