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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a5fcb764247e90b8e2a05f181b75a5f8aa0aac76d70240343d5d17991814b4c' 
  AND token = 'YhdZ598N/ETAYFJe5gFgMoLTC0soFJQe0/AtSA16wn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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