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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '051cff63fe147ae911b9afb74ba84a89149a8d236e559baf2a606d8f5af3cb06' 
  AND token = '0ZzBOUe2n320wzZvTOtJ2Bc0psWbOOljuY33kfOXkyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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