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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28cf34f2a9f89ef9a5eae815ccda60d237dd5cba56bdd0d26736b59939d3125f' 
  AND token = 'qrwC7rQdAM6X/TzK50BiMH1UqO+7/Leygh9tiq9PWF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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