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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1ce539545945f722be01dab3423d4a623730c7570d5fc328e9c7be9b371b25d' 
  AND token = 'dNj5uAdC/dnG5h0M4Zd8kNkkVNTreAg1m2F4l2QJluI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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