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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3eb8f682e1440ee082a1cc9777f2f362e6c10e03c26b42e52ef8f2fdbb97b3ee' 
  AND token = 'Ewt5rlNqBvSjkENAqn3LSKAUkW6WdX9c2ky65lOoqzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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