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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4776559193002f936a5cab0ad486ee9461524579187ebdb5e2f93bf80f2f317d' 
  AND token = '2NGiqVTT+cro7ptpbasSLQMd9qUSQMuybBJv5sgBdiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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