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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd560ea3bb85d6ca2abbdd15aa7fbbf2c1cd10f5e7f11cf2622e1227eee680653' 
  AND token = 'UKDCHeSMYGmRbfH0w3XQPp9N2DSBe6q9+GTETVUdMmk=' 
  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"
    }
  }
}