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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a7348f55b7ba4f7bb7c0144da56e0e9035cd78f48953774ffb872ef50d703ae' 
  AND token = 'b2jMLxTuo43dutM4zTIVVfVvJkc+kxQlA3stlvUEDw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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