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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a36347a666e7d5d11920d4699fbe4ff98350d916d4dc66af2da6318f1434cbb4' 
  AND token = '2q81FJ5paOOFxu/PNGqPoOSg6cAOb2FSAJk9MtJT92o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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