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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9656c79c72fe69f34f58cf4e95981465ba6f7f6482e0073ddbfbd964975f0117' 
  AND token = 't7w+7mK4p1qDpiT9oIf5OOPs1z9qbGROFQb0mmCNneg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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