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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '742a197ab2800db93bdae4eadc6797006439eb66957c49ec49630e6ac7826890' 
  AND token = '06fMvXWaudFqouctjV/vcyDGFIqiX9lxz2yQRcxJwrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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