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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05827d17f585d7192d9d2e15903240e6f432627bfd7f9b9a4d6b8a41174204e5' 
  AND token = 'PI/ELtxbgFK8z9K+WLn6Eo8OhMrK8g71VolI2/U2b1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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