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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9c06d8f4b1fb39ae5ac979a501183153a7ecf58635f4f1683551b757a9e6647' 
  AND token = 'CJ2VZFa6Uvkz6rfUWK3KsR8A1WWaJNKcKIx3XtEK0PQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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