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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6f904a99921bc89fe744b5f840470fc26bb61c88add3ace4650060230bd864f' 
  AND token = 'Nw5thk2LR8R08zUj1SP7CqQzQZxqJlpYc9XXlT3DnL4=' 
  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"
    }
  }
}