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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30bedd6f87ee72e4eb0198fdb436bbd1912981b6c18ee197c7d8fa640d7cb93b' 
  AND token = '7f/8CAH7wO5eN1OZhsoXVt0Z850RsImzjIqeeEI9nns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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