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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '673548ec87f62a4e48ec3fd65e37e5b0d3f4f04db8ff7df3745e8dea6cfe4c44' 
  AND token = 'e5N239R/opm82svzDuAIXhmiLsv6XsKQVQaVJ8Rld6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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