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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d5f1d9b35a7f0badae9d9f382004e78f910d1bf9d1c9143e5cbe364fa80a6c2' 
  AND token = 'mwHHsc17jVqfHyBhhjm92n0q1NHFcx82IYR3SUmc75Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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