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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f29339b84af8425d017af813a88369df5a49fb5933f625b3e0ed84af5a69a3a' 
  AND token = 'W/ZGG450MAyRogxCj3LF96e12lTXsmyuGe64T9d+kNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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