SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e93dda7d169fd81ed818b3e1d72cc71f463e2985030415c5539e2904a7bb9a0' 
  AND token = 'nZ7mcK5BH29FjvVCPUKvnKFuYUiVvs3adzAgDLIs4+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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