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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a08d9726dc77b2bc1783e9baba2d182df3449c1d02b172ae968c36e4c7b0006e' 
  AND token = 'iJ7/GUFzMqsuZ0e3I22NFiFhVS2xgNMZo1K/4Vie3J4=' 
  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"
    }
  }
}