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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0007f2b44831e3ca8e5f1b7a9e188e7f7962eda7d966091b953ca8e0736aa1d' 
  AND token = 'a5eCnqU3JZDtUAPJZbb/qRvR7dV/v+bK0HTaMoGKQu0=' 
  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"
    }
  }
}