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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '424799e85b4896019e60101e040dc4e9bc23cc1b870709fefd8c06acaed63199' 
  AND token = '6mNT/4miJreoPP3xxrwFKv/ZrLMgqOh6hNt6XRxobBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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