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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '499980f02b9bccd66e2e47bb990c5e0dac6391f8cd973fdec836ea9ed70f60f0' 
  AND token = 'CVsyRRAnjT09ghYySBHf6sLWDnWys1WOINBuAXB9s14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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